Sony Alpha DSLR-A100 Zoom Lenses for Sony Alpha DT lens mount

"Sigma's new Optical Stabilizer is very effective. Focus is pretty much instantaneous, and silent."

More advanced image stabilization Sigma OS

Fixed aperture The same aperture at all focal lengths

Silent focus motor Silent and fast

	Focus motor	Sigma HSM			Max focal length	50 mm
	Fixed aperture	Yes			Weight	0.6 kg
	Image stabilization	Sigma OS			Zoom range	2.9x
	Aperture	f/2.8			Min focal length	17 mm

"This is a very functional lens in low light situations when using a monopod. I used it for a show inside of an event center with a lot of success (if you are looking for motion blur in your action shots). Overall I really like the lens and would recommend it."

More advanced image stabilization Sigma OS

Silent focus motor Silent and fast

	Focus motor	Sigma HSM			Max focal length	50 mm
	Fixed aperture	No			Weight	395 g
	Image stabilization	Sigma OS			Zoom range	2.8x
	Aperture	f/2.8			Min focal length	18 mm

"This is a great value lens, and in my opinion can't be beat for the price. I photograph everything from wildlife to portraits to flowers and macro shots to landscapes. While this is not a do all lens, it fits right in and works for anything that fits within its 50-200mm zoom range. The build quality is also exceptional at the price, with no slop in the workings of the lens. It also comes with a lens hood that conveniently stores backwards on the lens. The focus is internal, so it good for polarized filters, tulip hoods, etc. All in all a great lens for the price."

More advanced image stabilization Sigma OS

Silent focus motor Silent and fast

Great telephoto lens 200 mm

	Focus motor	Sigma HSM			Max focal length	200 mm
	Fixed aperture	No			Weight	n/a
	Image stabilization	Sigma OS			Zoom range	4x
	Aperture	f/4			Min focal length	50 mm

"I just returned from a trip to San Francisco and was very satisfied with the performance of the lens. It worked well for street shots in Chinatown as well as wide angles at the Golden Gate bridge."

Fixed aperture The same aperture at all focal lengths

	Focus motor	None			Max focal length	50 mm
	Fixed aperture	Yes			Weight	450 g
	Image stabilization	None			Zoom range	2.8x
	Aperture	f/2.8			Min focal length	18 mm

"When shooting into the sun or other bright objects at small apertures, the aperture blades give a nice 16 point star effect with minimal flare."

Fixed aperture The same aperture at all focal lengths

	Focus motor	None			Max focal length	16 mm
	Fixed aperture	Yes			Weight	0.6 kg
	Image stabilization	None			Zoom range	1.5x
	Aperture	f/2.8			Min focal length	11 mm

"An excellent lens-especially for the price. The constant f2.8 maximum aperture makes it a first class, low light addition. It is solidly constructed and should last quite a while."

Fixed aperture The same aperture at all focal lengths

	Focus motor	None			Max focal length	50 mm
	Fixed aperture	Yes			Weight	434 g
	Image stabilization	None			Zoom range	2.9x
	Aperture	f/2.8			Min focal length	17 mm

"Great lens - a must for landscapes and real estate"

	Focus motor	None			Max focal length	24 mm
	Fixed aperture	No			Weight	n/a
	Image stabilization	None			Zoom range	2.4x
	Aperture	f/3.5			Min focal length	10 mm